/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __CHANNEL_STATS_COLLECTOR_H__
#define __CHANNEL_STATS_COLLECTOR_H__

#include "dsp_types.hpp"
#include "message.hpp"
#include "utility.hpp"

#include <cstdint>
#include <cstddef>

#include <hal.h>

class ChannelStatsCollector {
   public:
    template <typename Callback>
    void feed(const buffer_c16_t& src, Callback callback) {
        void* src_p = src.p;
        while (src_p < &src.p[src.count]) {
            const uint32_t sample = *__SIMD32(src_p)++;
            const uint32_t mag_sq = __SMUAD(sample, sample);
            if (mag_sq > max_squared) {
                max_squared = mag_sq;
            }
        }
        count += src.count;

        const size_t samples_per_update = src.sampling_rate * update_interval;

        if (count >= samples_per_update) {
            const float max_squared_f = max_squared;
            const int32_t max_db = mag2_to_dbv_norm(max_squared_f * (1.0f / (32768.0f * 32768.0f)));
            callback({max_db, count});

            max_squared = 0;
            count = 0;
        }
    }

   private:
    static constexpr float update_interval{0.1f};
    uint32_t max_squared{0};
    size_t count{0};
};

#endif /*__CHANNEL_STATS_COLLECTOR_H__*/
